The Broncos need 18 points Sunday to set the record for most points scored in an NFL regular season. The leaders:

Team Year Pts.

1. New England 2007 589

2. Denver 2013 572*

3. Green Bay 2011 560

4. New England 2012 557

5. Minnesota 1998 556

* One game remaining

The Denver Broncos have seen it all in this drama-filled season.

Yet, they’re 12-3 and one win from securing the top seed in the AFC playoffs for the second straight year, fulfilling a mission they set out to accomplish after their playoff pratfall against Baltimore last January.

“We’ve had a lot of ups and downs,” wide receiver Eric Decker said Thursday. “We’ve been through a lot. We’ve had to weather the storm week in and week out. It’s a testament to everybody if we can finish out the season strong with a win this Sunday and go into the playoffs with some momentum.”

The Broncos need 18 points against the Raiders (4-11) to become the highest-scoring team in league history and 28 to become the first 600-point team.

The latest casualty is linebacker Von Miller, who tore up his right knee at Houston last weekend and will undergo surgery within the week that will sideline him until summertime.

“I obviously feel bad about losing Von and feel bad for Von, but this team has faced adversity all season and when some of your top players are down ... everybody else has to step up,” Peyton Manning said. “We’ve done that all year and we’ll have to continue to have to do that again this week.”

The Broncos seem to have a new crisis every week.

After two team executives were suspended for drunken driving arrests on the eve of training camp, Miller was slapped with a six-game drug suspension to start the season. Clady signed a $52.5 million contract in July and went on IR in Week 2. Bailey’s missed a career-high 11 games. Welker had two concussions in a four-week span and hasn’t played since Dec. 8.

Coach John Fox needed open-heart surgery and during his month-long absence, a backup offensive lineman quit the team, Moore needed an emergency operation to save his left leg and Wolfe had a seizure-like episode on the team bus.

“You have to keep pushing forward regardless of what’s in front of you because nobody is going to stop and wait for us to catch up,” Bailey said. “You can’t take your eyes off the prize.”

The Broncos began the season in scramble mode because of Miller’s drug suspension and they’ll finish the same way now that he tore his right anterior cruciate ligament Sunday in Houston.

“He’s one of our better players. You’d love to have him. He’s not available, so we’ll do what we always do here and that’s next man up and keep rolling,” defensive coordinator Jack Del Rio said. The Broncos will continue to rely on Shaun Phillips, Robert Ayers and recently signed Jeremy Mincey to rush the passer. Phillips has 10 sacks so far and Ayers has a career-best 5½ sacks.

In the base defense, they’ll rely once again on Nate Irving, who had a spectacular game after Miller got hurt.

The Broncos replaced Miller on the roster by promoting weakside linebacker Brandon Marshall from their practice squad to play on special teams.

“Part of me thought they would try to bring in another pass-rusher. But who’s out there in Week 17?” Marshall said. “I’m elated they thought enough of me to put me up while we’re making a Super Bowl run.”